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Issue Date	Title	Author(s)
7-Nov-1998	Alluvial Placer Minerals in the Walawe Ganga Basin with Special Reference to Gemstones and Gold	Nawaratne, S. W.
2003	Polyasterism in Gemstones with Emphasis on Star Sapphire	Kumaratilake, W. L. D. R. A.

Showing results 1 to 2 of 2